fix: upgrade ajv from 6.12.4 to 6.12.6

Snyk has created this PR to upgrade ajv from 6.12.4 to 6.12.6.

See this package in npm:
https://www.npmjs.com/package/ajv

See this project in Snyk:
https://app.snyk.io/org/postman/project/a5c111c7-1bc9-4d89-849d-6732a81fc539?utm_source=github&utm_medium=upgrade-pr

package-lock.json

@@ -379,9 +379,9 @@
       }
     },
     "ajv": {
-      "version": "6.12.4",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.4.tgz",
-      "integrity": "sha512-eienB2c9qVQs2KWexhkrdMLVDoIQCz5KSeLxwg9Lzk4DOfBtIK9PQwwufcsn1jjGuf9WZmqPMbGxOzfcuphJCQ==",
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "requires": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
@@ -3336,9 +3336,9 @@
       }
     },
     "uri-js": {
-      "version": "4.4.0",
-      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz",
-      "integrity": "sha512-B0yRTzYdUCCn9n+F4+Gh4yIDtMQcaJsmYBDsTSG8g/OejKBodLQ2IHfN3bM7jUsRXndopT7OIXWdYqc1fjmV6g==",
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
       "requires": {
         "punycode": "^2.1.0"
       }

package.json

@@ -116,7 +116,7 @@
     "openapi2postmanv2": "./bin/openapi2postmanv2.js"
   },
   "dependencies": {
-    "ajv": "6.12.4",
+    "ajv": "6.12.6",
     "async": "3.2.0",
     "commander": "2.20.3",
     "js-yaml": "3.14.1",